Generalize visible descendant dirty bits to prepare for more properties.

third_party/WebKit/Source/core/frame/FrameView.cpp

Index: third_party/WebKit/Source/core/frame/FrameView.cpp
diff --git a/third_party/WebKit/Source/core/frame/FrameView.cpp b/third_party/WebKit/Source/core/frame/FrameView.cpp
index 3524f4d76886fecba87d9725b2c88cfc03c5905c..42f8782b2bf20757bbcaca791181b31098e29496 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
@@ -2845,6 +2845,7 @@ void FrameView::updateLifecyclePhasesInternal(
         DocumentAnimations::updateAnimations(layoutView()->document());
 
         forAllNonThrottledFrameViews([](FrameView& frameView) {
+          frameView.layoutView()->layer()->updateDescendantDependentFlags();

[chrishtr, 2016/12/01 16:13:37]

This is necessary because I removed the old ones in PaintLayer, and SPv2 does
not run
PaintLayerCompositor::updateIfNeeded. Also, this is an intended tree walk
required
for SPv2, to compute descendant-dependent flags in advance of the pre-paint tree
walk.

           frameView.layoutView()->commitPendingSelection();
         });
       }